Help with Speaker / Hifi / Volume Cut-out Issue

[strocky]

Recently dug out my 23 year old Kenwood M-58 Hifi Stacking system and gave it to a friend. However when he connects his own Pioneer speakers (8 ohms the same as the Kenwood speakers that came with it) the audio plays, then fades away and the volume control has to be used to re-gain the volume (see video link below 9 seconds in)

Wiring is as per pic, the hifi works fine in pre-amp mode
Any ideas?

https://imgur.com/zM4YAm9

 

[strocky]

Bump

 

[chiily]

Have you checked to see if the speakers are a short, maybe one of the drivers? That might be overloading the amp.

Is there anything in the manual about reducing the volume? A quick sleep mode, or some such setting?

 

[strocky]

Thanks for the response, tried two pairs of speakers (the original ones that came with it and the pair in the picture)
Both sets of speakers have the same issue, will see if setting it to source direct solves the issue (it's technically a 5.1 surround system amp not stereo)
Don't think it has a sleep mode

Found a service manual for it
https://www.manualscenter.com/manuals/kenwood/m58-service-manual.html#.XaW9q397n9R

 

[strocky]

My mates tried all the different presets inc source direct, same issue, volume keeps dropping

 

[Mark65]

Had a similar issue where the volume would rise to the maximum.
It was the volume control that needed a clean.
It looks like it’s not a conventional volume pot but an encoder that controls a integrated circuit
HTH
Mark

 

[strocky]

Was worried that was the case, will see if it can be used as a pre-amp without the volume issue, but that means either spending money on a stereo amp or maybe better just writing off the unit and trying to source a cheap stereo amp and turntable for my mate (which is mainly what he wants to use it for)

 

[Arkless Electronics]

Not worth fixing. would be (much!) more difficult to repair than a £1000 amplifier.